How to get the MAC address of the 'local' system given the IP address?

[Tom H]

On Sun, Feb 2, 2020 at 3:44 PM Little Girl <littlergirl at gmail.com> wrote:
> Tom H wrote:
>> On Fri, Jan 31, 2020 at 12:26 PM Little Girl wrote:
>>>
>>> It's case-sensitive. A lower-case i (hostname -i) returns localhost
>>> and an upper-case I (hostname -I) returns the LAN IP.
>>
>>"-i" returns the addresses associated with a system's hostname.
>>
>>"-I" returns all the addresses associated with a system.
>
> Thanks.
>
>>> Here's another way to get the LAN IP by using the ip command:
>>>
>>> ip route | grep kernel | cut -f1 -d'/'
>>>
>>> I also had that command in my notes written this way, but can't
>>> remember why:
>>>
>>> ip route | grep kernel | cut -f1 -d' ' | cut -f1 -d'/'
>>>
>>> Both give the same result on my computer, but maybe only one will
>>> work on certain systems or networks.
>>
>>"ip r | grep kernel | cut -f1 -d'/'" works because the network
>>address is the first record.
>>
>>"ip r | grep kernel | cut -f1 -d' ' | cut -f1 -d'/'" is the "proper"
>>way because it would be extensible if the network address were the
>>2nd/3rd/... record (for the 2nd, you'd use "... cut -f2 -d' ' ...".
>
> Good to know. I ended up playing around with it even further,
> changing each f1 to watch what happens. Very powerful stuff.

You're welcome :)